When x = 0, the value of the algebraic formula AX2 + BX + C is 1; when x takes 1 and 2 respectively, the value of the algebraic formula AX2 + BX + C is 0, when x takes - 1 What is the value of the algebraic expression AX2 + BX + C?

When x = 0, the value of the algebraic formula AX2 + BX + C is 1; when x takes 1 and 2 respectively, the value of the algebraic formula AX2 + BX + C is 0, when x takes - 1 What is the value of the algebraic expression AX2 + BX + C?

x=0,
The value of AX2 + BX + C is 1, so C = 1
x=1 a+b+1=0
x=2 4a+2b+1=0
So a = 0.5, B = - 1.5, C = 1
So the algebraic formula is 0.5x2-1.5x + 1
So when x = - 1, the algebraic value is 3